Also, I don't think the father necessarily has to have been Revan. She may very well have eventually moved on with her life, and may have even believed Revan to have been gone forever, or dead.

This is true, but unlikely at this point. Satele Shan (carrying Bastila's surname) is believed by the Sith to be Revan's descendant. Perhaps they are assuming incorrectly, but I think it's more likely that Satele did come from Bastila and Revan's lineage.